AAG

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To foster an understanding of remote sensing science.
Emphasis is placed on developing a meaningful dialogue
among geographers interested in understanding and applying
remote sensing technology in research, instruction, public service,
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2018 AAG RSSG Highlighted Session

Professor Doug Stow from Department of Geography at San Diego State University will be the
speaker of the John Jensen Distinguished Lecture Series organized by the Remote Sensing
Specialty Group of American Association of Geographers.

Abstract: Repeat station imaging (RSI) is an approach to multi-temporal image change analyses that
minimizes misregistration effects and enables real-time (i.e., on-board) change detection. RSI
involves returning the same sensor to the same airborne imaging stations (defined by specific
horizontal and vertical positions) over time, and geometrically processing images on a frame-by-
frame basis to maintain the benefits of replicated view geometry. This means that baseline (time-1)
imagery and flight line and image capture station locations must be available prior to capturing
imagery at later points in time. Platform navigation and location-based camera triggering is enabled
by global navigation satellite systems. Replicated view geometries mean that automatically
generated match points and fairly simple geometric transformation are adequate for achieving image
registration near the pixel level, and in near real-time. Anomaly detection algorithms can then be
applied to distinguish changes of interest from other changes and radiometric noise. The goal of this
presentation is to provide theoretical and technical background of RSI, demonstrate its
implementation for a range of geographic applications, and conclude with a vision of the follow-on
research that is required to move RSI to operational status for most applications. Theoretical and
technical elements of flight planning, image capture, geometric and radiometric pre-processing,
information extraction, and data and information delivery will be covered. Geographic applications
that will be covered include post-hazard damage assessment, law enforcement surveillance,
monitoring vegetation growth/decline, and measuring wildfire spread. Many of the follow-on research
requirements pertain to integration of RSI with small unmanned aerial systems.